CN103155656A - Method and apparatus for reliable control of channel performance - Google Patents

Method and apparatus for reliable control of channel performance Download PDF

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Publication number
CN103155656A
CN103155656A CN2011800487801A CN201180048780A CN103155656A CN 103155656 A CN103155656 A CN 103155656A CN 2011800487801 A CN2011800487801 A CN 2011800487801A CN 201180048780 A CN201180048780 A CN 201180048780A CN 103155656 A CN103155656 A CN 103155656A
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Prior art keywords
power
channel
error event
control
bit
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CN2011800487801A
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Inventor
普拉达普·文卡特拉马南·孔达
斯克特·R·克拉普
希里什·纳加拉杰
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Google Technology Holdings LLC
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Motorola Mobility LLC
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/16—Deriving transmission power values from another channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/20—TPC being performed according to specific parameters using error rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/32—TPC of broadcast or control channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
    • H04W52/221—TPC being performed according to specific parameters taking into account previous information or commands using past power control commands
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/32—TPC of broadcast or control channels
    • H04W52/325—Power control of control or pilot channels

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A method and apparatus is directed to achieving target error rates on a channel (130, 132) between a user equipment (120) and a network node (110). The method includes indicating an error event on a first channel between user equipment and a network node using a bit erasure. The method also includes controlling transmit power used by the user equipment on the first channel using predefined transmit power command values received by the user equipment on a second channel, wherein the second channel being between the user equipment and the network node. The transmit power is controlled based on the indicated error event to achieve a target error rate on the first channel.

Description

The method and apparatus that is used for reliable control channel performance
Technical field
Relate generally to control channel performance of the present invention, and particularly, relate to the uplink control channel performance for the Long Term Evolution of wireless communication system.
Background technology
Power control is the common mechanism for improvement of the uplink channel in wireless communication system and downlink channel.Be well known that, have many different cordless communication networks and technology, and each subsystem or technology has different mechanisms and the method that power is controlled of carrying out.In addition, existence makes power control lasting needs more reliably.
Such as the LTE(Long Term Evolution), in the third generation of senior LTE and IEEE802.16m and the 4th generation wireless communication system, be not used to indicate the effective ways of the mistake on uplink control channel.According to LTE and other fourth-generation systems, do not provide CRC check.Such as the uplink channel of physical uplink control channel (PUCCH) operating less than the low signal-to-noise ratio in the scope of 0dB (SNR).In addition, being difficult to these operations SNR, up link to be carried out Signal to Interference plus Noise Ratio (SINR) and estimating, is unreliable designator to signal quality in the use that power is controlled thereby make it.Because have a large amount of the variation in the 4-5dB scope, so SNR and SINR measure also existing problems in these are measured.Therefore, from the viewpoint that power is controlled, estimated ratio becomes nonsensical.
It is also understood that network dispatcher should not used such as the wrong PUCCH result of cqi (CQI), pre-coding matrix index (PMI), order indication (RI) etc. comes the allocation of downlink resource.Use these error results may cause the remarkable loss of throughput that causes due to packet loss.For uplink scheduling reliability and low time delay, need the correct reception of the dispatch request indicator bit (SRI) on uplink control channel.
In view of foregoing, need measure the reliability of channel and carry out close-loop power control (CLPC) with it.Need a kind of alternative method of measuring the quality of the signal on channel.In addition, need to alleviate the impact on system that causes due to the decoded in error on PUCCH.Yet another restriction is, may be by only realizing controlling for the transmitting power of PUCCH with the order of a limited number of transmitting power state of a control.Therefore, the needs design is a kind of can control with allow set and a limited number of order the system of desired error probability.In addition, quality metric can be reused, and working together with scheduler, and does not use the result of measured rub-out signal.
Description of drawings
Accompanying drawing is used for further illustrating various embodiment and is used for explaining all according to various principle and advantages of the present invention, in the accompanying drawings, like reference numerals each view refer to identical or function on similar element, and be incorporated in specification together with following detailed description and form the part of specification.
Fig. 1 is the exemplary wireless communications network that operates according to some embodiments of the present invention.
Fig. 2 illustrates according to the elimination event (erasure event) that is used for given log-likelihood ratio of some embodiments of the present invention and the block diagram of the correlation between error event.
Fig. 3 is the figure of the different transmission power command history that uses according to some embodiments of the present invention.
Fig. 4 illustrates according to the frequency of utilization of the how to confirm transmit power command set of the some embodiments of the present invention flow chart with the realize target value.
Fig. 5 is the figure for the definite value of different target that illustrates according to some embodiments of the present invention.
Fig. 6 and Fig. 7 are that the transmitting power that is identified for using at event time is controlled the flow chart of gathering.
Fig. 8 and Fig. 9 describe, are used for the figure of the power control simulation of explanation mistake in using event tolerance in conjunction with some embodiments of the present invention.
Figure 10 is the figure that illustrates based on the change of the sector throughput of the threshold value of determining according to some embodiments of the present invention.
Those skilled in the art should expect, for simple and purpose and element in accompanying drawing is shown clearly, and needn't draw in proportion.For example, the size of some elements in accompanying drawing can be exaggerated with respect to other elements, to help lend some impetus to the understanding to embodiments of the invention.
Embodiment
In the present invention, we describe the degree of reiability based on elimination factor, and it can be used for power and controls.We also describe the method that is used for power control of the finite state of using power control command.Before describing in detail according to embodiments of the invention, should observe, embodiment mainly is the method step relevant to the method and apparatus that is used for reliable control channel performance and the combination of device assembly.Therefore, device assembly and method step are suitably represented by the conventional symbols in figure, only illustrate and understand those particular details relevant to embodiments of the invention, so that make the disclosure with for the apparent details of the those of ordinary skills that benefit from the description here not obscure mutually.
In this article, such as first and second, the relational terms of top and bottom etc. can only be used for making an entity or action to distinguish mutually with another entity or action, and must not ask or hint relation that any reality between such entity or action is such or sequentially.Term " comprises " or its any other variant is intended to contain nonexcludability and comprises, make the process that comprises a series of elements, method, object or device not only comprise those elements, and can comprise and clearly not listing or such other intrinsic elements of process, method, object or device.In the situation that not more multiple constraint is not precluded within process, method, object or the device that comprises this element with the element that guides " comprising ... " and has other identical elements.
Will be appreciated that, embodiments of the invention described here can comprise the program command of one or more conventional processors and unique storage, the program command of this uniqueness storage in conjunction with specific non-processor circuit control one or more processors realize being used for reliable control channel performance described here some, great majority or all functions.Non-processor circuit can include but not limited to, radio receiver, radio transmitter, signal driver, clock circuit, power circuit and user input device.Like this, these functions can be interpreted as the step be used to the method for the method of carrying out reliable control channel performance.Alternatively, some or all of functions can realize by the state machine of stored program instruction not, and perhaps realize in one or more application-specific integrated circuit (ASIC)s (ASIC), wherein, some combinations of each function or specific function are implemented as customized logic.Certainly, can use the combination of two kinds of methods.Therefore, at this, method and apparatus that is used for these functions has been described.And, although may (motivate) great efforts and a lot of design alternatives because for example up duration, current techniques and economic consideration excite, but those of ordinary skills are when being guided by concept disclosed herein and principle in expectation, can easily generate such software instruction and program and IC with minimum test.
The present invention relates to a kind of method that realizes the target error rates on the channel between subscriber equipment and network node.The method comprises: eliminate error event on the first channel between equipment for indicating user and network node with bit.The method also comprises: use by subscriber equipment and control in the predefined transmit power command value that receives on second channel the transmitting power of being used by subscriber equipment on the first channel, wherein, second channel is between subscriber equipment and network node.Control transmitting power based on indicated error event, to realize the target error rates on the first channel.In an embodiment, the method is used recently misdirection event of log-likelihood, is the reliability of actual value with indication bit.Can determine that bit is the reliability of actual value with first threshold, and error event is the Second Threshold that outnumbers of log-likelihood ratio.Predefined transmit power command value comprises predefined power upwards (power up) order and (power down) order downwards of predefined power.The method can also comprise: use the upwards set ratio of order and predefined power down command of predefined power in the event of given number.Use the upwards order of predefined power when the misdirection event, and use predefined power down command when there is no the misdirection event.And the method can comprise: initialization emission control bit, with utilize bid value upwards and downwards bid value realize the probability of error event.
In another embodiment, a kind of method realize target error rate also.The method comprises: the elimination counting of determining the uplink channel between subscriber equipment and network node; From the indication of determined elimination counting generation error event; And determine emissive power control command based on error event, to regulate the power by subscriber equipment was used.The method can also comprise: with emissive power control command, target power is controlled and be sent to subscriber equipment.In an embodiment, the method is determined target power control.In addition, the method can comprise: use the random number variable of the percentage of the use with transmit power command to come realize target power to control.The error event indication is for definite upwards order with to the use of issuing orders.
A kind of device is also disclosed.This device comprises: transceiver, and this transceiver is the sending and receiving order between subscriber equipment and network node; And processor, this processor is coupled to transceiver.Processor eliminates to indicate error event on the first channel between subscriber equipment and network node with bit, and use in predefined transmit power command value received on the second channel between subscriber equipment and network node and control the transmitting power of being used by transceiver on the first channel, and be controlled at transmitting power on the first channel based on indicated error event, to realize the target error rates on the first channel.
Can the present invention be described more fully with reference to accompanying drawing.Fig. 1 is the block diagram of wireless communication system 100 according to an embodiment of the invention.Communication system 100 comprises: subscriber equipment 120, and such as, but not limited to cell phone, radio telephone, smart phone or PDA(Personal Digital Assistant), personal computer (PC) or the outfit laptop computer for radio communication.Communication system 100 further comprises base station (BS) 110, and this base station (BS) 110 offers communication service via radio link the subscriber equipment such as UE120 of the overlay area that is arranged in radio access network (RAN).Radio link comprises downlink channel 130 and uplink channel 132, and wherein each comprises a plurality of physics and logical channel, comprises a plurality of Traffic Channels and a plurality of signaling channel.A plurality of channels that are used for down link 130 can comprise physical downlink control channel (PDCCH) and physical down link sharing channel (PDSCH), and can comprise physical uplink control channel (PUCCH) and physical uplink link sharing channel (PUSCH) for a plurality of channels of up link 132.
Each in BS110 and UE120 comprises corresponding processor 112,122, such as one or more microprocessors, microcontroller, digital signal processor (DSP), its combination or other such equipment known to persons of ordinary skill in the art, processor is configured to carry out respectively the function described here of being carried out by BS and UE.Each in BS110 and UE120 further comprises at least one memory devices 114,124, it can comprise random-access memory (ram), dynamic random access memory (DRAM) and/or read-only memory (ROM) and equivalent thereof, data and program that its maintenance can be carried out by relevant processor, and allow BS and UE to carry out to operate needed all functions in communication system 100.Each in BS110 and UE120 also comprises for corresponding radio frequency (RF) transmitter 118,128 that transmits by radio link 130 and for receive the corresponding RF receiver 116,126 of signals via radio link 130.Transmitter 118,128 and receiver 116,126 usually be collectively referred to as transceiver.
Communication system 100 further comprises the scheduler 102 that is coupled to BS110 and carries out scheduling feature described here.Scheduler 102 comprises processor 104, such as one or more microprocessors, microcontroller, digital signal processor (DSP), its combination or other such equipment known to a person of ordinary skill in the art, processor is configured to carry out the function described herein of being carried out by scheduler.Scheduler 102 further comprises at least one memory devices 106, it can comprise random-access memory (ram), dynamic random access memory (DRAM) and/or read-only memory (ROM) or its equivalent, data and program that its maintenance can be carried out by associative processor, and allow scheduler to carry out to operate needed all functions in communication system 100.Although scheduler 102 is described to be independent of the element of BS110, but in other embodiments of the invention, scheduler 102 can be realized in BS, and more specifically, realize scheduler 102 by the processor 112 of BS based on the program that at least one memory devices 114 by BS keeps.
Here representation function when being carried out by scheduler 102, BS110 and UE120 by or be stored in corresponding at least one memory devices 106,114,124 that is associated with scheduler, BS and UE in and realized by the processor 104,112 that is associated with scheduler, BS and UE, 122 software program and the instructions of carrying out.Yet, persons of ordinary skill in the art will recognize that embodiments of the invention alternatively can realize with hardware, for example, integrated circuit (IC), application-specific integrated circuit (ASIC) (ASIC) etc. are such as the ASIC of the one or more middle realizations in scheduler, BS and UE.Based on the disclosure, those skilled in the art can be in the situation that do not test and easily produce and realize such software and/or hardware.
In order to make BS110 and UE120 participate in communication session, each in BS110 and UE120 operates according to known aerogram standard.In an embodiment, communication system 100 is the 3GPP LTE(third generation partner program Long Term Evolutions that operate according to 3GPP LTE standard) communication system.In order to ensure compatibility, radio system parameters and call handling process are specified by standard, comprise the call treatment step of being carried out by BS and UE.yet, one of skill in the art will recognize that, communication system 100 can be to distribute any wireless communication system of radio link resource, such as 3GPP UMTS(Universal Mobile Telecommunications System) communication system, the CDMA(code division multiple access) communication system, the CDMA2000 communication system, frequency division multiple access (FDMA) communication system, time division multiple access (TDMA) communication system or according to various OFDM(OFDMs) any one communication system that operates in technology, such as World Interoperability for Microwave Access, WiMax (WiMAX) communication system or according to for example 802.11, 802.15, 802.16 any one communication system that operates in the 802.xx standard or the IEEE(IEEE-USA of 802.20 standards).
Forward Fig. 2 to, show the block diagram of result that the method for the error event on uplink control channel 132 is indicated in explanation reliably.Use to be used for measuring the misdirection event at the log-likelihood ratio (LLR) of the elimination event that detects on PUCCH on up link and particularly.Elimination event on uplink channel is by defining as the number that the coded-bit of error event tolerance is eliminated.If the size of the LLR of coded-bit is less than given threshold value, this coded-bit can be defined as eliminating.Therefore, the receiver on up link can estimate based on the soft symbol that receives, that is, and and to the estimation of the accuracy of the things that is sent out and receives.
In an embodiment, it is probably or unlikely given bit that LLR is used to indicate the bit that receives, that is, be 1 or 0.LLR provides the probability of more convenient mechanism to indicate a bit or a string bit accurately to be received.The received possibility of bit that accurately receives is larger, and the absolute value of LLR is just more near 1.Therefore, large positive LLR indication bit is that 0 possibility is high, and large negative LLR indication bit is that 1 possibility is high.Similarly, the positive LLR indication bit near 0 is that 0 possibility is low, and is that 1 possibility is low near 0 negative LLR indication bit.In other words, the size of LLR value is relevant to the reliability of the bit that receives, and wherein, the symbol indication bit of value is the positive LLR of 0() or 1(is negative LLR).
Can recognize, can determine the elimination event of each bit, and can use LLR to measure such elimination event.Therefore, can determine 20 elimination events for 20 bits.In order to reduce the burden on PUCCH, coded-bit can be defined as indicating elimination according to the size of LLR.And elimination can only need to indicate LLR when to be increased to given threshold value, make when LLR during higher than given threshold value error event do not need to be instructed to.This is because the absolute value of LLR more approaching zero just indicates the probability of error event of this bit just higher.
In view of above content, value n can be used to indicate the number of needed elimination in a string bit.Value n can indicate the number of LLR, and its indication is less than the bit of determined LLR threshold value.In an embodiment, can be based on determined to require the threshold value of elimination by the error event possibility of LLR indication.In addition, but the elimination count threshold of the number of the acceptance error event of indication in a string bit can be set.For a string bit, if n is greater than eliminating count threshold, for this string, error event is for just, and error event is indicated by 1 bit.Otherwise 0 bit indicates n less than the elimination count threshold, and has the error event that can accept number in a string bit.Be appreciated that the LLR threshold value and eliminate count threshold according to the requirement of channel by configurable ground assignment.
Fig. 2 shows the LLR value 202 for a string bit.In the example shown, the LLR threshold value is set to 2.When determining, with the given LLR value that is used for each bit, elimination 204 for each bit is shown.Less than 2 bit, eliminate designated for LLR.For eliminating 204, determine n=3.Be 2 in the situation that eliminate count threshold,, and be worth 1 and transmit with this specific PUCCH and be associated to error event for this string bit-detection.
Up-link power is controlled can be based on the error event of determining for this string bit.Can recognize, power is controlled and can be changed according to the threshold value that is used for LLR threshold value and elimination count threshold.According to the LTE standard, can carry out transmitting power with 2 bits and control (TPC).Therefore, 2 bit TPC can send on down link in assignment according to the down link control information form.The representative value that should be appreciated that TPC is+3.0 ,+1.0,0.0 and-1.0dB.According to these values that receive, control up link TPC by making power raising 3.0 or 1.0dB, make power be in same levels or making power reduce 1.0dB on down link.Target is, with wrong on up link or eliminate incident rate and control to destination probability (PER on up link Target).
Use above-mentioned 4 typical TPC values, can use multiple combination.Can be based on the LTE of 2 bit TPC make to select four kinds of different combinations.The example of these 2 bit sets shown in Fig. 3, TPC set.The first bit can be used for upwards bid value of expression, comes upwards regulating power to control according to the value of upwards order thus.The second bit can be used for representing downward bid value, thus according to coming downward regulating power to control to the value of issuing orders.As example, TPC set is given as set 1[+3.0 ,-1.0] 302, set 2[+1.0 ,-1.0] 304, set 3[0.0 ,-1.0] 306 and [+3.0,0.0] 308.
Shown TPC set provides limited power to control.But, the target P ER of expectation TargetMay be in order upwards and the refinement more in order.Therefore, upwards order and each in issue orders may be used to specific percentage of time.These percentages are designated as λ value.λ value allows the various combination of a plurality of TPC command histories use different weight percentage, to obtain to be used for the expectation elimination factor of a string bit.According to the method, on each opportunity that sends the TPC order, use suitable λ value selection from the two condition TPC command history of Fig. 3.In case the TPC set is selected, just determine to have detected mistake or elimination event.If have such mistake or elimination event, just from the upwards order of this Resource selection.Otherwise, select in identity set to issuing orders.
For example, because CRC is not provided in LTE, can not be measured so 1% error rate can be supposed to.In an embodiment, elimination factor can be used for realizing expecting error rate by emulation.About as described in Fig. 1, determine given bit tool vicious possibility with LLR as above.With the LLR threshold value with 10% the target elimination factor of eliminating that the combination setting of count threshold can be corresponding with 1% error rate.TPC set 302-308 can be sent out according to suitable λ value, to obtain the elimination factor of expectation.In those times that the TPC order is provided, make sending determining of which TPC set 302-308.
Fig. 4 is the flow chart that the method 400 of definite λ value is shown, and this λ value is the probability target for the error event of the upwards bid value that uses the TPC set and downward bid value.In addition, λ value is specified for the upwards bid value of realizing the expectation error rate and the usage ratio of downward bid value.The method is by determining that given input begins.At first, the first input is set up 402 and is the PER of given percentage TargetPER TargetHave molecule N and denominator D.PER TargetCan have any given percentage.In addition, input is provided as Δ 1, Δ 2, Δ 3, Δ 4, wherein, each Δ is one that forms in the TPC value of TPC set.As mentioned above, these TPC values be+3.0 ,+1.0,0.0 ,-1.0.Fig. 5 shows different PER TargetThe λ value of appointment is provided according to described method, and wherein, λ value is the use percentage of each TPC value set.According to the TPC value, consist of the 404TPC set, wherein, set is for example { Δ 1, Δ 4, { Δ 2, Δ 4, { Δ 3, Δ 4, { Δ 1, Δ 3.
The method 400 is by determining PER TargetWhether value can be determined to continue with the TPC value Δ of appointment.In step 406, determining whether can be according to formula-Δ 4/ (Δ 1-Δ 4) come from Δ 4And Δ 1Determine PER TargetIf be true, in step 408, λ 1=1, λ 2=λ 3=λ 4=0.Referring to Fig. 5, this is for PER Target=1/2 is true.If this is not true, in step 410, determining whether can be according to formula-Δ 4/ (Δ 2-Δ 4) come from Δ 4And Δ 2Determine PER TargetIf this is true, in step 412, λ 2=1, λ 1=λ 3=λ 4=0.Referring to Fig. 5, for this PER Target=1/4 is true.If this is not true, according to formula λ 4=(N-D) Δ 4/ (N (Δ 1+ Δ 4)-D Δ 4), λ 3=1-λ 4, λ 2=λ 1=0, use the PER that expects TargetValue arranges λ value.Referring to Fig. 5, if PER Target=1/10, λ 4=3/4 and λ 3=1/4, and if PER Target=1/16, λ 4=5/6 and λ 3=1/6.Understandable from Fig. 4 and Fig. 5, λ is for given PER TargetThe use percentage of TPC set, make λ 1Corresponding to TPC set 1, λ 2Corresponding to TPC set 2, λ 3Corresponding to TPC set 3, and λ 4Corresponding to TPC set 4.
Forward Fig. 6 and Fig. 7 to, show the method 600 of determining to use which TPC set when event time.As is understood, described method controls with the indicated error event receiving on downlink channel the transmitting power of being used by subscriber equipment on uplink channel.Transmitting power is to use the controller of the predefined transmit power command that is received on down link by subscriber equipment, as describing about Fig. 4.As will be appreciated, control transmitting power with the realize target error rate based on indicated error event, indicated error event depends on selected elimination control threshold value.
In step 602, provide according to the method in Fig. 4 and from expectation PER TargetThe λ value of the given set of determining.By λ value, determine to work as λ iAnd λ jGreater than 0 o'clock, use which TPC set i and j.For example, if PER TargetBe 1/2,0% use λ 1/ TPC set 1, λ 3/ TPC set 3 and λ 4/ TPC set 4, and 100% use λ 2/ TPC set 2.If PER TargetBe 1/16,0% use λ 1/ TPC set 1 and λ 2λ is used in/TPC set 2,16.67% 3/ TPC set 3, and 83.33% use λ 4/ TPC set 4.In order to realize these percentage, generate 604 value r, it uses the uniform random variable between 0 and 1.Then, if r＜=λ i, determine 606.If this is true, use TPC set i according to step 608.Otherwise, in step 610, use TPC set j.In view of more than, should be appreciated that the PER for 1/2 Target, when being used for Δ up Δ down value, use TPC set 1.In addition, the TPC according to random number variable uses λ 3 and λ 4 gathers to realize 1/16 PER Target
Operating in Fig. 7 of Fig. 6 continues.Therefore, step 702 indication exists more than or equal to 0 Δ up in the TPC set and is less than or equal to 0 Δ down.This can gather referring to the TPC in Fig. 3.Step 704 determines whether to be used for using Δ up and the Δ down that TPC gathers.This determines from the physical measurement of observing in step 706, and this can determine and as above described about Fig. 2 by the observation of a string bit.Should be appreciated that step 704-706 determines whether to exist error event based on the physical measurement that for example LLR eliminates counting.Step 706 generates error event e (n) according to the LLR that eliminates.If determined error event e (n)=1 in step 708, in step 710, TPC is set to Δ up value.Otherwise, determine error event e (n)=0, and TPC is set to Δ down value in step 712.Therefore, in each situation, determine to send upwards ordering still to issue orders (DN command) in selected TPC set based on error event.In an embodiment, permit sending PUSCH TPC714 by PDCCH UL.Similarly, send PUCCH TPC714 by PDCCH DL assignment.
Fig. 8 and Fig. 9 illustrate the power control simulation that uses above-mentioned error event tolerance.As show, draw bit error rate (BER) and frame error ratio (FER) for given parameters.Also draw according to the determined elimination factor of described definite principle.As show, elimination factor is followed the trail of the physics tolerance such as BER and FER, and therefore is shown as reliable tolerance.In addition, above-mentioned power control algorithm is proved to be and concentrates on needed destination probability.In addition, power control algorithm is corresponding well with the target elimination factor.
Figure 10 shows and determines the best result of eliminating the measurement of count threshold.Be appreciated that from specification eliminating count threshold controls upwards order and send to the multifrequency of issuing orders numerously.Eliminate count threshold and determine whether the generation error event, and send upwards order and to issuing orders according to the error event that generates.Therefore, eliminate count threshold indirectly control error rate.Referring to Figure 10, eliminating count threshold affects the downlink sector throughput.As show, optional elimination count threshold is confirmed as 2.For example 4 or 6 larger threshold value has caused the higher BLER on less power control, PUCCH, and because the insecure feedback that reduces performance causes affecting downlink throughput.Therefore, exist about the compromise of elimination count threshold is set.If threshold value is set to too low, may ignore the value of actual report, force unnecessary HARQ to retransmit, and may postpone CQI, desired sum of ranks PMI and report the interval.On the other hand, if threshold value is set to height, more wrong PUCCH decoding will occur.
Described elimination count threshold can be used for strengthening the scheduler robustness.Replace this mechanism, may cause the incorrect characterization of channel condition from the data of wrong PUCCH reception.This may cause the PDCCH resource lower than-, surpass-or inferior-optimum utilization distribute.This also may cause the early stopping of crossing of HARQ processing.Virtual network operator also may distribute other PUCCH resources, with the shortage of compensation CRC.On the other hand, if come detected error event with described principle, can carry out suitable measurement by scheduler.If error event suitably detected, scheduler can use the parameter of indicating such as from CQI, diffCQI, PMI and the order of the previous PUCCH transmission with the elimination counting below the predefine threshold value rather than wrong PUCCH transmission.Error event can also be interpreted as the NACK of ACK/NACK bit.When multiplexing with data channel (PUSCH), same mechanism can also be used for the reliability of restriction uplink control information.
In above specification, specific embodiment of the present invention has been described.Yet those of ordinary skills will expect, in the situation that the scope of the present invention of setting forth in not breaking away from claims can be made multiple modification and change.Therefore, it is schematic rather than restrictive that specification and accompanying drawing are considered to, and all such modifications all are intended to comprise within the scope of the invention.Benefit, advantage, to the solution of problem scheme and may cause any benefit, advantage or solution to occur or the more obvious any element that becomes is not interpreted as key, desired and essential characteristic or the element of any or all claim.The present invention only claims of all equivalents by being included in any modification of making during the application unsettled and those claims of announcing limits.
Claims (according to the modification of the 19th of treaty)
1. method comprises:
Eliminate the error event of the use log-likelihood ratio on the first channel between equipment for indicating user and network node with bit;
Use by described subscriber equipment and control in the predefined transmit power command value that receives on second channel the transmitting power of being used by described subscriber equipment on described the first channel, wherein, described second channel is between described subscriber equipment and described network node, and wherein, control transmitting power based on indicated error event, to realize the target error rates on described the first channel.
2. method according to claim 1, wherein, indicate described error event to comprise: use described log-likelihood recently indication bit be the reliability of actual value.
3. method according to claim 2, wherein, determine that with first threshold described bit is the reliability of actual value.
4. method according to claim 1, wherein, described error event is the Second Threshold that outnumbers of log-likelihood ratio.
5. method according to claim 1, wherein, described predefined transmit power command value comprises predefined power upwards order and predefined power down command.
6. method according to claim 5 further comprises: use the upwards set ratio of order and predefined power down command of predefined power in the event of given number.
7. method according to claim 5, wherein, when the misdirection event, use the upwards order of described predefined power.
8. method according to claim 5, wherein, when there is no the misdirection event, use described predefined power down command.
9. method according to claim 1 further comprises: initialization emission control bit with utilize bid value upwards and downwards bid value realize the probability of described error event.
10. method comprises:
Determine the elimination counting of the uplink channel between subscriber equipment and network node;
Count to generate the error event indication of using log-likelihood ratio from determined elimination;
Determine emissive power control command based on error event, regulating by the power that described subscriber equipment was used, and
With described emissive power control command, target power is controlled and be sent to described subscriber equipment.
11. method according to claim 10 further comprises: determine described target power control.
12. method according to claim 10 further comprises: the percentage of the use of the described emissive power control command of initialization, to regulate the power that is used by described subscriber equipment, control with realize target power.
13. method according to claim 12 further comprises: use the random number variable of the percentage of the use with described transmit power command, control to realize described target power.
14. method according to claim 14, wherein, described transmit power command comprises upwards order and to issuing orders, and the indication of described error event is used for determining described upwards order and described use to issuing orders.
15. method according to claim 10, wherein, described error event comprises: use described log-likelihood recently indication bit be the reliability of actual value, and described error event is the given threshold value of outnumbering of log-likelihood ratio.
16. a device comprises:
Transceiver, described transceiver transmits and receives order between subscriber equipment and network node;
processor, described processor is coupled to described transceiver, wherein, described processor eliminates to indicate the error event of the use log-likelihood ratio on the first channel between described subscriber equipment and described network node with bit, and use in the predefined transmit power command value that receives on the second channel between described subscriber equipment and described network node and control the transmitting power of being used by described transceiver on described the first channel, and control the transmitting power of described the first channel based on indicated error event, to realize the target error rates on described the first channel.
17. device according to claim 16, wherein, the described log-likelihood of described error event use recently indication bit is the reliability of actual value.
18. device according to claim 16, wherein, in the event of given number with power upwards the set ratio of order and power down command control described transmitting power.
19. device according to claim 16, wherein, described processor initialization emission control bit, with utilize bid value upwards and downwards bid value realize the probability of error event target.
20. device according to claim 16, wherein, described processor comes realize target power to control with the random number variable of the percentage of the use with described transmit power command.

Claims (20)

1. method comprises:
Eliminate error event on the first channel between equipment for indicating user and network node with bit;
Use by described subscriber equipment and control in the predefined transmit power command value that receives on second channel the transmitting power of being used by described subscriber equipment on described the first channel, wherein, described second channel is between described subscriber equipment and described network node, and wherein, control transmitting power based on indicated error event, to realize the target error rates on described the first channel.
2. method according to claim 1, wherein, indicate described error event to comprise: use log-likelihood recently indication bit be the reliability of actual value.
3. method according to claim 2, wherein, determine that with first threshold described bit is the reliability of actual value.
4. method according to claim 1, wherein, described error event is the Second Threshold that outnumbers of log-likelihood ratio.
5. method according to claim 1, wherein, described predefined transmit power command value comprises predefined power upwards order and predefined power down command.
6. method according to claim 5 further comprises: use the upwards set ratio of order and predefined power down command of predefined power in the event of given number.
7. method according to claim 5, wherein, when the misdirection event, use the upwards order of described predefined power.
8. method according to claim 5, wherein, when there is no the misdirection event, use described predefined power down command.
9. method according to claim 1 further comprises: initialization emission control bit with utilize bid value upwards and downwards bid value realize the probability of described error event.
10. method comprises:
Determine the elimination counting of the uplink channel between subscriber equipment and network node;
Count to generate the error event indication from determined elimination;
Determine emissive power control command based on error event, regulating by the power that described subscriber equipment was used, and
With described emissive power control command, target power is controlled and be sent to described subscriber equipment.
11. method according to claim 10 further comprises: determine described target power control.
12. method according to claim 10 further comprises: the percentage of the use of the described emissive power control command of initialization, to regulate the power that is used by described subscriber equipment, control with realize target power.
13. method according to claim 12 further comprises: use the random number variable of the percentage of the use with described transmit power command, control to realize described target power.
14. method according to claim 14, wherein, described transmit power command comprises upwards order and to issuing orders, and the indication of described error event is used for determining described upwards order and described use to issuing orders.
15. method according to claim 10, wherein, described error event comprises: use log-likelihood recently indication bit is the reliability of actual value, and described error event is the given threshold value of outnumbering of log-likelihood ratio.
16. a device comprises:
Transceiver, described transceiver transmits and receives order between subscriber equipment and network node;
Processor, described processor is coupled to described transceiver, wherein, described processor eliminates to indicate error event on the first channel between described subscriber equipment and described network node with bit, and use in the predefined transmit power command value that receives on the second channel between described subscriber equipment and described network node and control the transmitting power of being used by described transceiver on described the first channel, and control the transmitting power of described the first channel based on indicated error event, to realize the target error rates on described the first channel.
17. device according to claim 16, wherein, described error event use log-likelihood recently indication bit is the reliability of actual value.
18. device according to claim 16, wherein, in the event of given number with power upwards the set ratio of order and power down command control described transmitting power.
19. device according to claim 16, wherein, described processor initialization emission control bit, with utilize bid value upwards and downwards bid value realize the probability of error event target.
20. device according to claim 16, wherein, described processor comes realize target power to control with the random number variable of the percentage of the use with described transmit power command.
CN2011800487801A 2010-10-05 2011-09-28 Method and apparatus for reliable control of channel performance Pending CN103155656A (en)

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